CNAMEs are handled very weird - please change this

The implementation of CNAMEs are done in a really weird way.

1) If the agency choose to have the website too, the agency is forced to have the main domain as THE domain, e.g. "mydomain.com", that is so much 201x . There are very good reasons to not do it that way, so stop forcing agencies to have the main domain like that. It should be up to the agency to decide whether they want "www.mydomain.com", "mydomain.com" or e.g. "myreviewsystem.mydomain.com".

2) Now it is recommended to set one more A record in the DNS for a sublevel domain, e.g. "www" which is supposed to be the same as the main domain. So in reality there are two A records. This is not the way to do it, or at least enable the ability to do it the way it should be (and right now you seem to check whether the sublevel domain is really an A record, which is odd). The way to do it is that only ONE A record is set in the DNS, then any other sublevel domains referring to the same address, should be defined with a CNAME pointing to the main domain, so e.g. "www.mydomain.com" should have a CNAME set to "mydomain.com", NOT have two DNS A records with the IP addresses like it is now.

3) Finally, and this is also very important... If the website option is not used so only the CNAME is set to point out the application, it points out your domain "app.embedreviews.com", which s ssuper easy to find out by just doing an nslookup to see how a certain CNAME is defined. This means that your white label in reality is NOT fully white labeled.

Instead, I suggest that you have an unidentifiable domain where you place the app and then point to that. It would be even better if you also placed the domain name contacts behind a so called name proxy which is the standard these days for many domain name providers.
So in this case, the CNAME could be set to point out e.g. "[agency-selected-name].hhhsj72729.com" and then have a page on "hhhsj72729.com" that does NOT redirect to embedmyreviews.com, but instead responds with a blank page.
I am surprised that it works the way it does today when everything else has been implemented with agencies in mind.